Cannabis can harm short-term memory and attention, raise the risk of anxiety, paranoia, and psychosis, irritate the lungs when smoked, and stress the heart during use. Roughly 3 in 10 people who use cannabis develop cannabis use disorder, and the risks are highest for teens, pregnant people, and daily heavy users. CBD products that contain only trace THC do not cause a high, but they still carry some of their own cautions.
how does cannabis affect your health
How does cannabis affect the brain and memory?
THC binds to cannabinoid receptors in the brain, including areas that control memory, learning, and coordination. Right after use, people often struggle to recall recent information, stay focused, or react quickly.
How Does Cannabis Affect Your Health? THC, CBD, and Risks
Effects on the developing brain matter most. Cannabis use in adolescence has been linked to problems with attention, memory, and school performance that can outlast the high itself.
- Short-term memory lapses during and after use
- Slower reaction time and impaired coordination
- Reduced attention and problem-solving speed
- Lasting cognitive effects with early, heavy use
Can cannabis use cause mental health problems?
Cannabis can trigger anxiety, panic, and paranoia, especially with high-THC products or in people who are sensitive to THC. Heavy use is also associated with depression, social anxiety, and lower motivation, though cause and effect can run both ways.
Can Cannabis Use Harm Your Health? What the Evidence Shows
The strongest mental health concern is psychosis. Daily use of high-potency cannabis, and starting young, are linked to a higher risk of psychotic symptoms and schizophrenia-related disorders.
What is cannabis use disorder?
Cannabis use disorder is a pattern of use that causes real problems at work, school, or home, plus craving and difficulty cutting back. Tolerance and withdrawal, including irritability, insomnia, and appetite changes, are common signs.
Treatment exists. Behavioral therapies such as cognitive behavioral therapy and motivational enhancement therapy help many people reduce or stop use.
How does smoking cannabis affect the lungs?
Cannabis smoke contains many of the same irritants and tar found in tobacco smoke. Regular smoking is tied to chronic cough, wheezing, phlegm, and bronchitis.
Vaping and dabbing avoid some combustion products but still deliver concentrated irritants and, in unregulated products, contaminants such as vitamin E acetate.
Does cannabis raise heart risks?
Cannabis raises heart rate and can change blood pressure right after use. Studies link heavy or frequent use to a higher risk of heart attack, heart failure, and stroke.
People with existing heart conditions should talk with a clinician before using cannabis in any form.
Is cannabis risky during pregnancy?
Cannabis use during pregnancy is linked to lower birth weight and preterm birth. Public health agencies advise avoiding cannabis while pregnant or breastfeeding.
What is cannabinoid hyperemesis syndrome?
Long-term heavy cannabis use can cause repeated episodes of severe vomiting and abdominal pain. Many people with this condition find relief from hot showers, and symptoms usually stop after quitting.
Does CBD carry the same risks?
CBD does not cause a high, so the memory, psychosis, and impairment risks tied to THC do not apply in the same way. High-dose CBD can still cause liver injury in some people and can interact with medications processed by the liver.
Choosing lab-tested CBD with a clear certificate of analysis helps you confirm THC content and screen for pesticides, heavy metals, and solvents.
Who should avoid cannabis?
- Teens and young adults whose brains are still developing
- People who are pregnant or breastfeeding
- Anyone with a personal or family history of psychosis
- People with heart disease or uncontrolled blood pressure
- Anyone taking medications that interact with cannabis